Speed-changing mechanism.



F. IOHNSON.

' SPEED CHANGNG MECHANISM. APPUCATION HLED Nov 6.191;

1,147,868. v Patilnted July 2T, 1915.

5 SHEETS-SHEET l4 WITNESSES F. JOHNSON.

SPEED CHNGIN-G MECHANISM. mucmlon FILED Nov. e. 1913.

5 SHEETS-SHEET 2.

Paented July 2?, 1915.

F. JOHNSLW.

SPEED CHANGING MECHANISM.

vAPPLICIUION-HLED NOV. 6.1913. A .ny

Patented July d, 1910.

i l WITNESSES l F. JOHNSON.

v SPEED CHANGING MECHANISM.

y APPLICATION FILED NOV. 6'. ISIS. 1,147,868. Patented July 27, 1915.

l s SHEETS-I-sHEET 5.

iCk-5565 Y mkb ukmsvcmf.

'of Detreia, in the county Miene; ennemi or memoir; im,oeiIvfgiiiiii.4

SPEED-erinnern@ Meenemen.

memes;

Ta all wiomz' may concern:

Be it kneivii that e FRANK' Johnson, a ciiizen of 'the Unified States, anilfa resident nf Wayne and Siate of li'licliigan, have invented aI new aiiii useful Speed Changing liieehanisin, if

which the following is a sspeeihealimi,

This invention 'relates te means for chang;-

ing he relati've speeds of the crank shafts and of the propeller shaf'is of power-driven veliieles, unil its object is to previile a sini-y le sind effeeive transiiiiseioii iiiechanisin which shall be iontrolleil by a selecting ilevice so eenslriieteil that it may be positioned any time prior to the ehiinging'of the transniiesien gears.

rihis invention consists in Cninbinaiien with an inilieaor and a plurality oi inov able Selecor (rains eenneeeil @hei-ete, of a transmission gear slilfiing iieviee comprising an operai-ing nieniber and :i series of eoiiiiollers adapted to engage the selectors and gear Shifters operaieii by saiil aetnating member whenever their respective controllers are properly poeitieneii by the selector. A

in the accompanying drawings, Figure l is a lside elevatioii of lie eonaining the controller aiiil of the aeiiiating mechanism. Fig. Q is a rear ei'eifaion of one 0i' the e0nneetione. Fig. is a vertieal section of a dog in cenirnlihe actuating lever. Figi. i is a longitudinal eeeion of the controller.

Fig. 5 isla vertical sectinn of the euntrolleix Fig. ii is a view-ef the enni'oliei' cams arrangel in tivo rivs, the, speed or positioning earns being in ihn upper rmv and the rains for causing the parte in be nioi'eil ce neutral posiion lli-,ingv in lie lower rmi'. Fig, 7 is a veriieal sei-tien of the traiieinis sion ease and of the case fer the. enniririll'ing' iiieelianiezn en the plane of lie crank shaft. Fig. 8 iS :i detail of the reversing' gear anii. Siii'ei. Fig. i) is ii liorizenal seeiiini iiif the ease Shown in Fig. l un alie plane 0i the gear-shifting: r ils,-the peilal aliaft being.

broken away Within the ease. Fig'. il) is a plan of a seering .vlieel of an auiaiiubile.

Similar reference characters 'iel'er i0 like parte thriiugihout the several vieiva.

'lhia invention is designed 'in farilitaie lhe elianging er he reversingmr nl he speeil uf peiverairiven venielee, anil innsiia gener ally ei an infiieaing ileviire i-niugirising a movable member which izan he Shifteii by the ilrii'er in conjiineien with a Hi'iie which Sliecfiation of Letters a'tent.

" Patented Jiiiy 273119215.

Appiicaiimiaied November @,ieis. seriaiiimeefns.

has cliaiacers,indicating ythe relative speed iii-iii ilii'eetiiin 0i' movement. Fig. lOshows lioiv this device may be preferably nieiinted i .ai the lieail of the steering post above the steering wheel. The changing of the gears,

anil' thereby nl' ihe speed. 0i direction of ythe vehicle, is preferably 'eii'eeeuated by theeluteh iieilal of the vehicle, which pedal during the first portieri of iis 'forward nieveineni ilieengages he engine from the transmission genre and iliein, if desired, shifts the gear already in engagement to neutral posiy tion. the heginning of the return invovenien iii the eliitehpeilal the selected gears,if

the speed or direction in be changed, are f i sliifieci inte engagenieiitiindduring the last poi-ren of he return movement ,of the clutch pedal, the eliiii-h is perniiieil to conneet the 'crank Shaft w the i:rain-iinission` gears su that `the engine will be immediately eoiiiileil to' lie driving axle.

in the aermiipaiiyiiig diaivings, repre- Senis he crank shaft of the engine to which is eeniieeieil the iliiiin 7 having ii'cliitch ring 8. li'iiiisiiiission ensei) carries ball hearings l() for the transiiiissiiin vinain Shaft li, nhieh emilie-ets; to the propeller sliaftl by nieane` of a universal coupling' 13, and

f the iiiipellei shaft eenneets i0 the iearfaxle in "ehe vehicle in any ilesireil iiiaiiner. This ease il also eari'ies a ball bearing.; i4 for the. transinisbiien stub shai'li liv; ivhese 'Forward eiiil has seeiii'eil teo it a (liek lli, ivliieli (farries Ythe pine; li' iliat extend 'ihrmigrli the plaie lfh forming the seeonil eluh'h ineiiibei.4

This plate. is sei-iireil le a huh l) against'. which the ring: 2() is pressed by means of the usual i'ianl arni 2l` iiibiinieil un the shaft fil. The i'i'nn eiiil 24 of tliiastiil) 'shaft is giiiileil in run eiiiiceiiii'ii'allv vi'vitli the ii'aiilesliaifi (i b v means mi ilne ball bear-k ing irv le5iieil means nia).v be proviileil for iniiiiei-iiiig the shaft ifi-l iii the peilal shafi 22? si) yilial- 'they will rernlve ingeilier in he saine ilirieiiini. (hi i'hir; shaft 29 ie aeciii'eil :i ilmviiivariilv extending: crank-arm il() havingr a pin 2li extendingi ihi'iaiirli the Slot 32 in he front emi nl" the link jiisi'alile ship ZH liiiiis the iwiwai'il innvenien' ui' hia iink. A i-laiuii 35 mi this link rei'eivis the rear eiiil oi the ieiisiiiii Spring v Thi, he forward 'eiiil ai' ii'hii'h eminente in ilie eve il?.

The rear enil ni lie al-iih snail: rs eiiiargeii iinil i'iiiineil tu rniifiiiiiiie. he gear 157 that meshes with the gear 38L on the countershaft 39. Securedto this countershaft are gears 40, 41'l and 42. The front end 44HL of the shaft 11 is journaled in roller bearing in the rear end of this stub shaft 15.

On theshaft 11 is slidably splined the clutch member 46 having internal teeth 47 that are designed to engage the complementary teeth 48L on the rear end of the stub shaft 15. It will .be noticed that when this clutch member 46 is moved to the right in Fig. 7, which is toward the front of the vehicle, that the stub shaft 15 and the shafts 11 and 12 will all be in direct engagement and revolubleat the same eed. But if this clutch member 46L is'slidsiack until its gear teeth 50 engage with the gear 40 on the countershaft 39, then the gear 37 on the intermediate shaft 15, which is in constant engagement with the ear 38 on the countershaft, will drive this shaft 11 through the countershaft, the gear 40 and the gear 50 at a somewhat slower speed than the speed of the crank-shaft. Thesetwo speeds are known as the 4fourth and third speeds respectivel Slidably7 splined Ion. the shaft7 11 are twoconnected gears52 and 53, adapted respectively to mesh with the gears 41 and 42 on the counter shaft. vWhen these gears 52 and 53 a e shifted to the right until the gear 52 en ages the gear41, the clutch 46 being in the position shown in Fig. 7, then the intermediate shaft 15 will drive the shaft 11 through the gears 37", 38, 41 and 521; but `when the ear 53* is in engagement with the gear 42", t en the countershaft will drive the shaft 11 at its slowest speed. These two are known as the second and first speeds of this transmission, respectively.

Loosely slidable and revoluble on the reversing gear shaft 54, mountedin the case as shown in Fig.f8, are the connected reversing gears 55 and 56. These-.gears are shifted to the right, in Fig. 7. toward the engine in the ordinary vehicle, until .the gear 55 meshes with the gear 53 and the gear 56 meshes with the gear 42'. The other 'gears remain in the positions shown in Fig. 2. This engagement of the ears 42-56- 5553 will cause the sha t 11 to turn in .the opposite direction from the shaft 15.

The details ofthe transmission thus far described form no part of the present inf vention, and any other proper transmission may be substituted therefor. The gears of this transmission may be shifted by means of the rods 60, 61 and 62, for respectively the reverse,` the first and second, and the third and fourth speeds. It will be noted that only one of these rods should be shifted at any tlme from its neutral position, shown 1n Fig. 4, and for this reason, they are provided kwith grooves 64, into which the ends of the interlocking bolts .65 and 66 enter when the next adjacent rod is shifted. These rods are slidable in transverse holes 67 and 68 in the case 9. Vertical holes inthe case above these rods contain the guides 69, pins 7 O and springs 71, as shown in Fig. 7. The pointed lower'ends of these pins enter the grooves 64 and holes 7 3 in these rods to hold them in any desired position. Collars 74, 75 and 76 on these rods carry the forks 77, 7 8 and 79, respectively, whereby the gears are connected tothe rods. These rods 62, 61 and 60 connect to links 81, 82, 83, 84 and S5, which connect to the collars 86, 87, 88, 89 and 90, respectively, of the pairs of selector cams --76, 71-77, 72-78, 73-77 and 74-80 respectively, of the reverse, 1st, 2nd, 3rd and 4th speeds, respectively, by means of pins 96 Vthat pass through the lugs 97 on these collars. Connected to the case 9 of the transmission is the case 98 of the selecting `mechanism, which carries the bearings 99 and 100 of the gear 'shifting mechanism.` Attached to this case 98 is` a small ease 101 for a connecting gear. The connecting rod 33 attaches to an arm 102 (Fig. 1) on the end of the hub 103 of the gear shifting drum 104, to which is secured a head 105 having a hub 106, journaled in the bearing 100. Rods 107 extend through holes in this drum and act as pivots for the dogs 108 mounted in pockets cut in the drum in the transverse planes of the collars 86 to 90 inclusive.'

These collars may be held in position by spring-rings 109. These dogs 108 are provided with inwardl turned noses 110 and tails 112 (Fig. 5) W ile compression springs 113 are mounted between the tails of the dogs and the still remaining portions of the drum. 'The collars 86 toy 90 inclusive are provided with notches 115 and v116, the shoulders of which are shown to be about forty-five degrees apart. The bearing sleeve 124 for the trunnion 123 kof the shaft 120 is mounted in the hub 103 of the drum 104, while the shaft 120 will pass through the hub 106 and have its outer end mounted in the bearing sleeve 121 in the outer cover 101 of the case 101. On this shaft 120 is secured a gear 125 which meshes with the segmental gear 126 on the shaft 127. Tle shaft, 120 is .provided with a key 118 on which the selector cams are mounted. These are formed of two designs, as shown in Fig. 6.

The cams 70 to 74 inclusive differ only in the position of the key-seat 75, while the cams 76 to 80 inclusive again differ only in this manner. These cams are slid onto the shaft 120, in pairs,.the cams of'the upper row alternating with those of the lower, all positioned by the key 118,\and each cam of the upper row being immediately to the left, in Fig. 4, of the one just below it in Fig. 6. As in theformer application, the cams are all shown in their neu.

tral positions, andit will be noticed that each cam of the upper row has a low portion about sixty degrees in length, and thev position of these `low portions varies through 132 is mounted and turned in any desired manner, but is preferably connected to the lower end of a .shaft 134e mounted in the steering post, and erably secured to the upper end of this shaft. .f1 notched V,segment 13G may be secured to the steering post above the wheel 137 and be provided with notches opposite the characters R, N, 1, 2, k3 and 4,'which denote reverse, neutral, 1st speed, 2nd speed, 3rd speed and 4th speed, respectively. The selector cams may therefore be properly positioned, according to the position of the indicator IlThe angular movement of the indicator will be multiplied by the gear 125 and segment 126, and, while any desired movement of the 'indicator andselector may be provided for, the mechanism shownis Aso constructed that a movement of the indicator from N to ll will turn the selector sixty degrees to the left. By swinging the indicator to the notches marked 1, 2, 3 or 4, the selector will be turned sixty, Aone hundred twenty, one hundred eighty or two hundred and forty degrees, respectively. The diilerent views show the selector at neutral position. The upper dog 108 for each collar is in the vertical plane of one of therams l'to S0 inclusive, called the neutral, cams, while.. the lower dog 108 is in the planeet vone ot' the cams 70 to 71 inclusive, called the speed cams. This is indicated in Fig. 4. The reverse 7 cams must be turned to the left a distance of G0 degrees-to bring' them to operative position. The lirstfspced cams 7l and 77 must be Iturned 30 degrees to the right; the second speed camsl 72 and 7S must be turned 190 degrees to the right; the third speed cams must be turned 180,A degrees to the right;

and Ithe tourtli `speed cams must be turned :H0 degreesvto the right, to bring these particular cams to operative position. llach oin these distances are indicated by dotted lines in Fig. 1'. When each 'of the neutral rcams has beenvturned its proper distanre. itsI highl spot will be under tbe nose of its dog and extend about 45 de grecs to the right, and prevent the tail ot' this dog from.engaging-the shoulder 115 of its collar. lint the upper dogs oi!I all the other collars are not held inoperative but may all engage the shoulders 115 of their rcsiiective collars andturnsuch collars to neutral. The only one oi the collars and gear shifting links (Si to 85 .1nclusive) whichwill no2-1 be moved to neutral will be 11G ot' their'collars.

an indicator 135 is prefof the crank arm 102.

the collar and link of the speed selected.` At the same time, the proper speed camv will be turned a proper distance and its low portion will be under the nose of its dog. All the otherI dogs will have their noses in contact with the high portions of their cams and their tailswill thereby be heldout of engagement with the shoulders Because et' the length of the high portions of the neutral cams and of the low portions of the speed cams, there is no danger of any change in position of the dogs during either stroke The slot 4Q in the crank armlOZ is inclined to the line ot' the arm, and receives the pin 43, carried'by therear end of the link 33. The crank arm 102 has a lug 45, shown in Fig. 2, adapted to engage the adjustable ,stops 46 and 17, on the case 98.

The distance between these stops is such that ythe actuator hub 10J: will be turned the proper distance at each movement of the clutch pedal.

It will be noticed that the lower dogs 108 operate on the return stroke of the crank .ar-'ms 30 and 102, and that when tlietail of the selected dog is lett in contact with the shoulder 116 of its actuating collar, and the dog is under pressure from the spring 3G, considerable force will be required to turn the selector cam which happens to be engaged because of the friction between the tail of the dog and the shoulder 111i.' l To obvia-te this friction, it is desirable to move suificient to disengage the dog and shoulder 11G. The mechanism to accomplish this is -sbown in Figs. 1 and 2l. l

back (to the vright-fin,lfig. 1) the pin 43 slides down to the-'lowerend of the slot 42 in the crank arinf109. and swings this arm until the. lug or tin @i5 on the crank arm 102 engages the stop if?. This movement causes all vbut the selected gears oin the transmission to be moved to neutral position. During this rearward movement, the cani 5S may engage the, pawl .f )ll and swing it back, but a t'ter the cani has passed the lug, the latter will be returned by the spring 50. llpon the return or forward 'movement vol` the link under action oi the spring :lo or the crank arm 30, the arm 102 will swing forward until the lug 45 engages the stop lili-2 This is 'the movement whereby the lower dogs l108 ,the crank arm 102 a short distance forward,

yao

carry the collars 86 around to the left and are left with their tails in'engagement with the shoulders 116. Toward the end of this forwardmovement, the cam 58 passes below the pawl 53, which causes the pin 43, to be so far down the slot 42 from the shaft 103 that the arm 102 engages the stop 46 and thus makes a full stroke. passed this dog, the spring 36 will tend to swing up the rear end of the link 33, the front end being substantially stationary becauseA of the pin 3l and stop 34. This upward movement of the rear end of the link causes the pin 43 to slide up in the inclined slot 42 and to press back the lower end 0 this crank arm, as shown in Fig. 1, and thereby causes'the disengagement of the tail of thedog 108 from the shoulder 116. The selector can now be turned freely.

Referring now to Fig. 7, it will be remem-V bered that the drum 104 is turned by the arm 102 and carries the dogs 108 with it. The distance is about thirty degrees, first to the right and then to the left. All the neutral cams 76 to 80 are shown in Fig. 6 in neutral position, and it will be seen that at the beginning of their movements, each of the teeth 110 of the upper dogs will drop, if it has not already dropped, the tail of each dog being swung out by its spring 113. If the 3rd speed gears are in en agement, the rod 62 will be at the left end o its movelment and the collar 87 will be turned to the left nearly thirty degrees and the" collar' 86 thesam'e distance to the right. At the movement of the crank arm 102 to the right, the upper dog 108 .will immediately engage in the notch 115 of the collar 87 and turn it to the right, to the ositionshown in'Fig. 5. This movement o in the collar 86 being turned an equal `distance to the left, because of the connection of the two collars to the rod 62 by means of thev links 81 and 82. In a similar manner, should the rod 62 and the gear-clutch 46 be in their 4th speed position, that is, at the right end of their movement, the collar 86 will have been turned to the left, and :will be turned back to the right by rne'ans':'of.its

upper dog 108 and by the drum 104 to shift the gear-clutch to neutral. The same' action occurs when the 1st and 2nd speed gears'are to be shifted to neutral position. When the reverse gears are in mesh, the rod is at the `right end of its movement and the collar 90 is turned to the left. Therefore, when the selector is at neutral position, the upper dog will turn its collar to theright and slide the reverse gears to the position shown in Fig. 7. It will be evident that if the transmission gears are set for any speed and it is desired to change to another, that the gears in mesh must be shifted to neutral. To effect this, the various cams shown in Fig. 6 are provided with high and low portions. In conl l 0 l l l c sldering this mechanism 1t ma swung to the notch When the cam 58 has -`arm.102. When the carn 78 i turne the collar l87 will result be remembered that` the cams shown in ig. 6 turn in the same'direction to and from neutral as the indicator 135 in'Fig. 10. If now the reverse gear isA in mesh and-'it is desired to change to the 1st speed, the indicator is 1 This will turn the selector cams thirt degrees to the right from the positions s own in Fig. 6. At the forward movement of the arm 102 and the turning of the drum 104 to the right, the nose of the upper do of the cam 77 will ride on the high part o this cam and the dog will have no effect on the collar 89, but the f' nose'of 4the upper dog of the reverse cam 70 will ride on the low portion of the cam and its tail will engage the notch 115 of the collar 90 and turn this collar to the right and so shift the reverse gears 55 and 56 to the left, that is, toneutral. At the end of this movement, the tail ofthe lower do of the cam 77 will reach the notch 116 of t e `collar 89, andas the nose of this dog is nearly against the low portion of the cam 77, the collar 89v will be turned to the left, forcing the rod 61 to the left and the gear 53 into mesh with the gear 42 on the countershaft. The cam 78, which cordinates withthe collari 88, is so formed that its lower dog is held out of engagement with its notch 116 during the time the rod 61 is beingl shifted b the one (hun. red and twenty degrees t the right,

the the noses of the u per dogs of all the uni except 78 engage ow portions of their respective .cams and thus shift the rods 60, -61 62 to neutral if not already there. At the `ireturn of the arm 102 thevnose of the lower dog rides on thelow portion of the cam 78, and its tail will engagethe notch 116 of the collar 88, turning the collar tothe'left and forcing the yrod 61 tothe right yb means of the link- 83, thus obtaining secon speed.

When the third speedis' desired, the selector` is turned one hundred 'and eighty degrees to the right.y Thisbrings the ow portion of the cam 79 under the noseof its Vupper dog, and as the collar'88'had been left turned to the right, when the arm 102 is'swungl, the tai'lfof this dogwill engage the notc 115 and the 'collar will be turned to neutral position.v In lthis case as in all others, the upper 1oo i dog returns the collar to neutral position.

The lower dog always doesxthe positioning. As the'3rd. speed is desired, the upper do ofy cam 79 will'rideinoperatively on t ehigg portion of this cam, so that, iftherd speed were already in use, it would not belbrou ht back to neutral. But on the return stro e, l.

the nose of the lower-dog will ride on the,

low portion of the cam73 andthe tail of the dog will engage in the notch 116 of the colthe left, 'ull lar 87 and turning this collar to the rod 62 to the left, thus .obtaining t ird speed. l In a similar manner the nose of the I cooperative gears..

` is lheld out of "any ixed support.

f l'ends ofV the teeth to engage,

spring 'will continue to slide the shifted' combination of operating .cachv pair adapted niet,

will be shifted to neutral 'at the next ton 'Ward movement of the clutch-pedal. The shifting of the selected gears Uo operative position is preferably accomplished by means of esprimg 36 connecting' to the link 33 and rifhis spring will normally shift the gears in advance o any I ythrust from the crank arm 30. But in casethe shifting gears should be so positioned vthat their teeth 'abut end to end with the cooperative gears, the jamming; action ot the -armf`w1il assist the spring to canse the after which the gears along to full engagement. The pro-` portions and adjustments oi the parts are such that the main clutch of the engine Wiil not begin toA engage-until the shifted gears `havefabout one-half the lengths of their teeth in engagement with the teeth of the f Manychanges 1n the proportions and aru rangements of the parts can be made by those, skilledv in the art without departing from the spirit of my invention.

claim;

Lin a speed changing mechanism, the

devices for shifting the gears of a pow/er transmitting fle'- vice, each embodying arevoiubie collar and a, connecting rod, arevolnbie actuator, a

series pairs ot dogs carr ied thereby, one pair for cach operating device, one dog of to move a shifting; rod' to vneutral position' and the other dog'to -inovosaid rod 'and the gears connected thereto tooperative position, and a selecting cam `foreach of said dogs.

, ln a speed changing mechanism, the combination of of plurality of collars and a connecting rod for each collar, a i'erohxhle actuator, o series of pairs of dogs carried thereby, one pair for each operating collar, one dogoi each pair adapted to inove e coln lui' and the gears connected thereto to neutral `position and the other dog to move said collar and the gears gonnected thereto'tol operative position, and a cam to properly w position eachdog.,

actuator, a4 scrics ot pairs,

In a speed changing mechanism, the `combination of a plurality of gear shiftingy` collars, each adapted to lic revolved in both directions from neutral position', a revoluble of dogs carried yeach pair adapted to move its thereby, onepair for each collar, one dogo collar and the gears connected thereto to nentrai position and the vother dog to ino'vesaid coller and the gears connected thereto to operative position, a seiecting' .cani `tor each dog, and ineens tor positioning the selecting cams.

i. in a speed changing mechanism, the

`combination. of a 'plurality of gear shifting devices, cach adapted to be moved in both directions from nentralposition, :i revolnble actuator, a series of pairs of dogs carried thereby, one pair for cach operating device, one dog o each pair adaptedto'znove the device to neutral position and the other dog to more said def-rice to operative position, e selecting cani 'for each dog, and means for positioning the selecting cams.

5, in a speed changing mechanism, the combination with a plurality of gear shifting collars, a drum on .which the collars are mounted, a pair of dogs 'for each collar mounted on thedruni, each dog adapted to turn tir;A lcollar in one direction, a seiector concentric with the collars and drum vto control lthe operation of the dogs and comsprisiiig'a cani for each dog, and means for positioning said selector.

.6; ln a speed. changing nie-p jo'isin, the combination of a hollow operating drum having a series of pairs 'of transverse slots, longitudinal pivot rodseitending across the shitsydogs mounted in saidslots on said pivotg rods and constituting pairs, a collar mounted on the drum in the planes of each pair of clogs and formedvto be engaged by the dogs, e rotatable selector mounted within pair of dogs and formed to be engaged hy,

the dogs, a rotatable selector .tionnted within wthe drum and engaged hy the dogsL and consisting of `a 'series ofcains united side by side, one for each dog, said cams having high and portions of one cam of each pair being of the sante length as the low portion of the othergfsaid cams adapted to predcterinine thel positioning of the dogs and collars.

' "8, ln a gear changing device, the com bination of collars, each adapted to he both directions from neutral posi tion, a icv'oluble hollow drinn on which the collars-'aromounted, a series of pairs of dogs carried!thereby, one pair for each collar,

one. dogl -o'ieach pair adapted to move 'the collar to neutral 'position and the other dog low portions, the highv ic to move said collar to operative position, a

' rotaryselecton mounted Within said drum ysaid dogs to position the. same, and means to turn the shaft.

9nn a speed changingmechanism, thel i combination of an indicator, a selector connect` thereto, a drum in which said selector V is mounted, dogs pivotally mounted in the drum, a series of collars on the drum and having a series of internal notches which may be engaged by the dogs to revolve the collars, a slotted crank-arm connected t0 the drum, a pin slidable in the slot, a link connected to said pin, an operating arm connected to the link to turn the crank-arm and drum in one direction, and a spring to move the pin in the slot to turn the drum in the opposite direction.

10.` In a speed changing mechanism, the

combination of an actuating drum, a crank f arm connected thereto and having an inclined slot in its outer end, a pin in said slot, a link connectedto said pin, an operating arm connected to the link to turn -the crank-arm and drum in one direction,

and a spring to move the pin in the slot to 'swing back the crank-arm.

11. In a speed changing mechanism, the combination of a revoluble member, a crankarm connected thereto and having an inclined slot in its outer end, a pin mounted in the slot, a link connecting at its rear end to said pin, operating means connected to the link at its front end to swing said link and crank-arm in one direction, a spring connected to. said link to move the link in the opposite direction, the line of the spring being such that after the front end of the link has' come to rest, the rear end will be swung by the spring that the pin will move in the slot and swing back the crank-arm.

12. In a speed changing mechanism, the combination of a revoluble member, a crankarm connected thereto and having an inclined: lot in its outer end., a pin mounted in the slot`,"a' link connecting at its rear end to said pin, operating means connected to the link at its front end togswing said link and crank arm in one direction, a spring connected"` to [said link to move the link in theopposite direction, the line of the spring being such that after'the front end of the link has come to rest, the rear end will be so swung bythe springthat the 'pin will move in 'the slot and swingy back the crank arm, and means to prevent the rear kend of the link from swinging under the pull of the spring until the front end has comet'o rest.

13. In a speed changing mechanism,y the combination of a revoluble member, a crankarm `connected -thereto and having an in clined slot in its outer end, apin-mounted in the slot. a link connected at one end to said pin, operating means connected to the opposite end of the link and adapted to move the arm and link in one direction, ya. spring connected to the link to move it in the opposite direction and to`swing it to move the pin in the slot and thereby move back the arm after the op osite end of the link has come to rest, and) adjacent the link. to prevent the movement of the pin in the slot until the arm and link have reached the limit of their movement in one direction. i

14.' In a speed changing mechanism, the combination of a plurality of gear shiftin rods, each adapted to be shifted longitudinally in both directions from neutral posia pivoted pawl tion, operating devices for shifting said i to to operative position, and a selecting mechanism for said dogs.'

15. In a speed changing mechanism, thecombination of aplurality of ear shifting rods, each adapted to bey shited lon itudinally in both directions from neutra poston, operatin 4devices for shifting said rods, each embo ying a revoluble collar and a connecting rod, a revoluble actuator, a series of palrs ofvdogs carried thereb one pair for each operating device, one og of each pair adapted to move a shifting rod to neutral position and the other dog to move said rod and the gears connected thereto to operative position, and a cam to properly position each pair of dogs.

16. In a speed changing mechanism, the combination of a plurality of gear shiftin rods, each adapted to be shifted longitudinally inboth directions from neutral position, operating devices for shifting said rods, each embodying a revoluble collar and a connecting rod, a revoluble actuator, a series of pairs of dogs carried thereby, one pair vfor each operating device, one dog of eachpair adapted to move a shifting rod to neutral position' and the other dogl to move said rod and the gears connected thereto to operative position, a selecting mechanism for said dogs, and an indicator for positioning the @electing mechanism.

17. In a. speed changing mechanism, the combination otaeplurality of gear shiftin rods, each adapt to be shifted lon tud nally inboth directions from neutra position, operating devices for shifting said rods, eachembod ing a revoluble collar and a connecting ro a revolubleactuartor, a .series of pairs of dogscarried'thereb ,one pair for eachoperatmgdevice, one i v of eachvpair adaptedto move a shifting mgl to nol v .in-eases neutral position and the other dog to move -said rod and the gears connected thereto to operative position, a selecting mechanism for said dogs, an indicator for positioning the. selecting mechanism, and a graduated bar adjacent said indicator.

1S. ln a speed changing mechanism, the combination with a plurality of rods for shifting the transmission gears o a vehicle, links for shifting each of said plurality ofi' rods and the gears connected thereto to and from neutral position, collars to which said links are connected, a revoluble actuator, dogs carried thereby, and a selector for positioning said dogs and thereby detertor, dogs carried thereby, and a selector for positioning said dogs comprising a series of connected cams, one for each links Winch cams determine the collar to be revolved and .its direction ofrevolution.

20. In a speed changing mechanism, the

combination with a plurality of rods for shifting the slidable gears of a vehicleI transmission, of a pair of links connected to each A of said plurality of said rods, each link of i each pair adapted to shift the rod and'gears connected thereto longitudinally into engaging position at one side of neutral, a

revoluble collar connected to each link, a drum on which said collars are mounted, engaging members for each' collar mounted on the drum, a selector to predetermine Ithe collar and its direction of movement by said drum, and means to oscillate the drum.

21. In a speed changing device, the combination of an indicator, a plurality of selector cams connected thereto, and a transmission-gear shifting device comprising an' operating member, a series of controllers adapted to engage the selectors, and gear engaging members actuated by said operating member whenever the proper controllers have been properly positioned bythe selector.

22. In al gear changing device, the combination of a plurality of gear shifting rods, each adapted to be shifted longitudinally in both directions from neutral positlon, operating devices for shifting said rodseach embodying' a. revoluble collar and a connect- ,ing rod, a revoluble hollow drum; a series of pairs of dogs carried thereby, one pair for each operating device, one dog of each pair adapted to move a shifting rod to neutral position and the other dog to move said Vrod and the gears connected thereto to operative position, and a rotary selector mounted Within said drum.

ln testimony whereof l have signed this specification in the presence of two subscribing witnesses.

FRANK' JOHNSON. l/Vitnesses:

HUco W. KREINBRING, L. M. SPENCER. 

